The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
Is Mounjaro Going Up In Price This September?
Mounjaro (tirzepatide) pricing in the UK can change, and many people are asking about September cost increases. If you're considering this prescription-only weight management injection or already using it through the NHS or private prescribing, understanding pricing is important. This guide explains what affects Mounjaro costs in the UK, how NHS access works differently from private routes, and what you need to know about your eligibility and treatment options.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
Understanding Mounjaro Costs In The UK
Mounjaro pricing varies significantly depending on how you access it. Through NHS specialist weight management services (tier 3), the cost is covered by the NHS if you meet eligibility criteria — though availability varies by region and waiting times can be lengthy. Private prescribing through UK-licensed online providers typically costs between £129 and £320 per month depending on your dose. Each KwikPen contains 4 weekly doses, so costs reflect the dose strength you're prescribed. Starting doses (2.5 mg) are usually cheaper than maintenance doses (15 mg). Price changes can occur due to supply chain factors, exchange rates, or pharmaceutical pricing adjustments, but there's no standard "September price increase" across all UK providers. If you're accessing Mounjaro privately, check directly with your prescriber or pharmacy for current pricing, as this changes regularly and varies between providers.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS Access Vs Private Mounjaro Routes
If you qualify for NHS treatment, Mounjaro is provided free through your specialist weight management service — no out-of-pocket cost, though you may face waiting lists of many months depending on your area. For NHS eligibility, you typically need a BMI of 30 or above, or 27–29.9 with weight-related conditions like type 2 diabetes or high blood pressure. Private prescribing offers faster access without NHS referral, but you pay directly. Both routes require a clinical assessment to confirm Mounjaro is suitable for you. Our free GLP-1 weight loss calculator can help you understand potential outcomes at different doses, while the BMI calculator helps you check if you fall within eligibility thresholds before speaking to a healthcare professional.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Does Mounjaro cost more on the NHS than private?
No. On the NHS, Mounjaro is free if you meet eligibility criteria and are prescribed through a specialist tier 3 weight management service. Private routes cost £129–£320 per month depending on dose. NHS access has no upfront cost but may have longer waiting times.
Why might Mounjaro prices change in September?
Pharmaceutical pricing can shift due to supply and demand, exchange rates, distribution costs, or provider pricing adjustments. There's no universal September increase — changes vary by private provider. Always check current pricing with your prescriber directly.
How do I know if I'm eligible for NHS Mounjaro?
You typically need a BMI of 30 or above, or 27–29.9 with weight-related health conditions. Eligibility assessment happens through your GP referral to a specialist tier 3 service. Use our free BMI calculator to check your starting point, then discuss with your GP.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar between the two — both typically cost £129–£320 per month privately depending on dose. NHS costs are zero for both if you qualify. The main difference is mechanism (Mounjaro is dual GIP/GLP-1, Wegovy is GLP-1 only) and dose range, not cost.
Can I switch between NHS and private Mounjaro treatment?
Yes, but it requires careful planning and prescriber coordination. You cannot hold an active NHS prescription and private prescription simultaneously. Discuss any switch with both your NHS provider and private prescriber to ensure safe continuity of care.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.